http://book.klll.cc/ebooks/author/45956.opds?sort_order=title 2025-11-19T08:03:09Z Books by Pierre, de Maricourt, active 13th century Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-19T08:03:09Z https://en.wikipedia.org/wiki/Petrus_Peregrinus_de_Maricourt See also: en.wikipedia 2025-11-19T08:03:09Z https://book.klll.cc/ebooks/50524.opds Letter of Petrus Peregrinus on the Magnet, A.D. 1269 active 13th century de Maricourt Pierre